The GIF Pronunciation Page

The GIF graphics file format was invented by CompuServe in 1987. In the years since, a debate has been raging as to the correct way to pronounce "GIF": like "jif", or with a hard 'g' as in "gift" as a majority of Mac users seem to prefer.

Marc - I have always called them with a hard 'g', what about you?
The GIF Pronunciation Page